FFmpeg c++ H264 decoding error

Question

I have a program which capture video from webcam, encode with ffmpeg, encoded packet then write to buffer. At the receiver side, read from buffer decode with ffmpeg and play

Answer 1

You need to include a parser. The ffmpeg mpeg1/2 decoders happen to work fine without a parser, but h264/mpeg4/vp9 need a parser, or you'll get errors like the above.

Note that if you use libavformat for demuxing and call avformat_read_frame(), it will automatically parse for you, but since you're doing buffer management yourself, you need to include the parser yourself also.